Natural Climate Change
An introduction to Natural
Published on: Mar 3, 2016
Transcripts - Natural Climate Change
11/9/12❖ Xtranormal due today❖ Project due Tomorrow❖ Unit 6 Quizlet due Tuesday 11/20❖ Be checking your grades❖ Weekly Reporter
Review❖ Explain the difference between weather and climate.❖ Compare and contrast the major types of climate as described by the Koeppen system.
Objectives❖ Describe natural processes that can affect earth’s climate.❖ Understand the causes and effects of El Nino.
Question❖ How do natural processes affect climate?
Climate Change❖ Think: What have you heard about climate change?❖ Pair❖ Share
Climate Changes❖ Natural changes in the Earth’s climate can be broken into two categories ❖ Short-term changes ❖ Long-term changes
Long-term changes❖ Types of long-term climate changes ❖ Ice Ages ❖ Solar Activity ❖ Earth’s Orbit
Long-term changes❖ Ice Ages ❖ What is an ice age? ❖ Periods of time where glaciers cover large parts of Earth’s surface ❖ Earth alternates between ice ages (glacial periods) and warm periods (interglacial periods)
Long-term changes❖ Ice Ages ❖ Last ice age ended 10,000 years ago ❖ Ice stretched as far south as Indiana ❖ Earth was on average 5 degrees C cooler
Long-term changes❖ Solar Activity ❖ Periods of high activity have been connected to warmer temperatures on Earth
Long-term changes❖ Earth’s Orbit ❖ Scientists believe that every 100,000 years the orbit of the Earth changes shape ❖ Brings the Earth closer to or further from the Sun
Short-term changes❖ Short-term climate changes ❖ Seasons ❖ Volcanoes ❖ El Nino
Short-term changes❖ Seasons ❖ I’m going to assume that you have this one ❖ Any questions about how a season is a short-term change?
Short-term changes❖ Volcanoes ❖ How would the eruption of a volcano affect the Earth’s climate?
Short-term changes❖ Volcanoes ❖ Eruptions release dust, smoke, and ash ❖ What do you think those things do to the amount of sunlight that reaches Earth?
Short-term changes❖ Volcanoes ❖ Dust and ash released from a volcano blocks incoming sunlight ❖ Cooler temperatures on Earth have been connected to big volcanic eruptions
Short-term changes❖ El Nino ❖ A short-term change in the water temperature of the Pacific Ocean
Short-term changes❖ El Nino ❖ Normally winds push warm surface water towards Australia ❖ Because warm water is pushed away, cold water can rise near South America ❖ Fish like cold water
Short-term changes❖ El Nino ❖ Occasionally the winds switch direction ❖ Warm water gets pushed to South America ❖ Fish don’t like warm water ❖ Hurts the fishing industry
Short-term changes❖ Effects of El Nino❖ More rain and storms across South America❖ Drought conditions in Australia and the South Pacific❖ Stronger hurricane season in the Atlantic